The futility of terror

I'm the last person to condemn taking up arms in opposition to tyranny.  Among my personal heroes are such men and women as Vercingetorix, Boadicea, William Wallace and George Washington.  However, I believe terrorism is both tactically unsound and morally bankrupt.
It seems to me that the unchivalrous methods used by terrorists only serve to firm the will of the enemies.  When old men and women are drug from their beds and murdered, when bombs kill random, innocent civilians, it's easy for the other side to feel justified in fighting you.  When your bombs are killing children of your own people, they no longer feel the need to support you.
Gandhi, for all his faults, had the right idea on how to fight an empire like the British.  While his tactics would not have worked against the Soviets or the Chinese, he was able to convince the Brits that the right thing to do was to give India back to the Indians.  I think that similar tactics are the only thing that would free the five Celtic nations from English imperialism.